chore(receivables): remove legacy-era receivables sources

app/Domains/Receivables/Http/Resources/PaymentMethodResource.php

@@ -1,28 +0,0 @@
-<?php
-
-namespace App\Domains\Receivables\Http\Resources;
-
-use App\Domains\Accounts\Http\Resources\CompanyResource;
-use Illuminate\Http\Request;
-use Illuminate\Http\Resources\Json\JsonResource;
-
-class PaymentMethodResource extends JsonResource
-{
-    /**
-     * Transform the resource into an array.
-     *
-     * @param  Request  $request
-     */
-    public function toArray($request): array
-    {
-        return [
-            'id' => $this->id,
-            'name' => $this->name,
-            'company_id' => $this->company_id,
-            'type' => $this->type,
-            'company' => $this->when($this->company()->exists(), function () {
-                return new CompanyResource($this->company);
-            }),
-        ];
-    }
-}